Artificial tooth



A. H. SIBLEY.

ARTIFICIAL TOOTH.

APPLICATION FILED APR. 7, I921.

1,396,07 1 Patented Nov. 8, 1921.

. and State of New Jersey,

AMOS H; SI BIJEY, 0F SHIP BOTTOM, NEW JERSEY.

ARTIFICIAL TOOTH.

Specification of'Letters Patent.

Patented N ov.'8, 1921.

-,Applioationfiled April 7, 1921. Serial No. 459,353.

To all 10 ham may. 1 concern Be it known that I, AMos H. SIBLEY, a citizenof the United States, and resident of. Ship Bottom, in the county of Ocean have invented certain new and useful Improvements in Artificial Teeth, of which the following is a v specification.

This invention relates to that olassrof artificial teeth in. which a facing of porcelain orother refractory substanceis detachably secureditoa metallic backing; ,myrobject being :to provide for such teeth a simple and efficient construction whereby a firm and stable yet detachable connection between the facing and backing can be had, as will be hereinafter described and claimed.

In the drawings' Figure 1 is a rear elevation of a tooth facing, enlarged, embodying my invention.

Fig. 2 is an elevation of the metallic backin therefor.

ig. 3 is a sectional elevation of the combined facing and backing.

Fig. 4 is a vertical section of the same, on the line 4-4 of Fig. 3.

Fig. 5 is a horizontal section thereof, on the line 5-5 of Fig. 3.

Fig. 6 is a perspective view of the facing.

eferring to the drawings, 10 designates a facing of porcelain or the like, on the posterior of which is an integral longitudinally-extending projection having a median channel 11 therein which terminates short of the lower end of the projection so as to provide two spaced vertical ribs 12 having a basal connection 13 somewhat above the incisory edge of the facing. The outer edges of the ribs 12 are undercut to provide grooves 14 which terminate in the basal connection and form therein two spacedapart shoulders 15. The upper ends of the ribs terminate somewhat below the root of the tooth and are recessed, as at 16, to provide upstanding lips 17.

The metallic backing 18 substantially conforms with the contour of the facing, the fiat surface of the backing being appropriately recessed and channeled for interlocking engagement with the rearward projection of the facing; that is to say, the backing has formed therein two parallel grooves 19 which are closed at their upper ends and terminate at their lower ends in a common recess 20 of sufiicient size to receive the basal part of the projection of'the facing.

Spaced apart abutments 20 vided in the backing. the respective grooves are thus pro- The outer walls of are undercut, as at 21, and their closed upper ends are undercut, as at 22.

To combine the porcelain facing and the.

metallic backing above described, the ribs 12 of the facing are seated in therecess 20 oflthe backing and the upper ends of the ribs are entered inthe open lower ends of the grooves 19.

tively moved longitudinally of each other so as to slide the ribs 12 into interlocklng engagement with the grooves 19 and the basal portion 13 into the recess 20; the wall 23 between the grooves thus snugly entering the channel 11 between the ribs of the facing and contacting against the basal connection 13, and the spaced abutments 20 of the backing also contacting with the spaced shoulders 15 of such connection. At the same time, the ribs 12 enter the recessed upper ends of the grooves 19, and the undercut extremities of the ribs contact with the opposing ends of such grooves. The parts thus associated are cemented together as usual.

From the foregoing it will be seen that the facing is effectually reinforced and strengthened by the integral rearward projection; that the facing and backing have adjacent their lower portion three spacedapart points of contact which effectually distribute and resist the biting stresses to which the tooth is subjected; that such stresses tend to maintain the interlocking engagement of the combined parts, and further that the described connection of the backing and facing avoids all liability of their lateral displacement relatively to each other.

I claim 1. An artificial tooth comprising a porcelain facing and a metallic backing, said facing having a longitudinal posterior projection in the lower portion of which are formed a plurality of spaced-apart contact shoulders, the longitudinal edges of said projection being undercut and said backing being recessed and grooved to interlock with said projection and present spaced-apart portions which contact with the shoulders of the facing.

2. An artificial tooth comprising a porcelain facing and a metallic backing, said facing having a longitudinal posterior pro- The parts are then relathe lips 17 of jection constituted by two spaced-apart ribs receive the ribs, said grooves terminating at their lower ends in a common recess which receives the said basal portion and also provides spaced-apart abutments for the said shoulders, the wall between the grooves being fitted in the channel between the said ribs and seated upon the closed lower end of the channel.

' 3. An artificial tooth'comprising a porce- 'lain'facing and ametallic backing, said facing having a longitudinal posterior projjection formed with a median longitudinal channel terminating in the basal part of the projection and providing two'longitudinally-extending ribs, the outer edges of said ribs being undercut to provide grooves which terminate in the said basal part of the-projection so asto provide spaced-apart shoulders, and the upper ends o'f said ribs being recessed to provide upstanding lips, and the said backing havlng formed therein. two. longitudinal grooves which receive said ribs, saidgrooves being closed at'their upper ends'and'terminating' in a common recess which receives the basal part and also provides spaced 'apartlabutments 'for the said shoulders, the outer, walls of said grooves being undercut to receive the" grooved edges ofthe ribs,'the upper ends of the grooves beingundercut to receive the upper recessed ends of the ribs, and the space between said grooves constituting a wall which enters ribs.

Philadelphia and-State of Pennsylvania, this second day of April, A. D. 1921;

Y 1 V AMOS H.'SIBLEY.

the channel between said Signed "at Philadelphia, in the county ot 

